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    Re: re Lars Tornqvist nav program - misch hints
    From: Lars Tornqvist
    Date: 2002 Feb 6, 12:38 -0000

    Hi Peter, George and others
    Unfortunately the Sight program will only run on a Windows platform as it is
    written in Visual Basic! Also I have no experience with Mac so I can't tell
    if these Super Mac's are able to do it?
    Timing :
    At present the computers clock must be set to GMT to run in 'Real-Time-Mode'
    This I will make user definable asap as others have asked the same question.
    For now you can key in any time and date you wish and also Simulate the sky
    movement - BUT if you check the checkbox "Use PC-clock" the computers time
    will be used as GMT - be patient I will correct this matter!
    The Sun Moon and Planets will be accurate back in time - how long I don't
    know - but believe 100 years back will give you an accuracy of the Sun
    within 2-3 arcmin but Moon and Planets perhaps more! I havn't checked it
    out - but let me know of your findings.
    The Stars on the other hand, are not udated for Proper Motion and Apparent
    movement YET - (this might be done next week) Therefore don't rely on the
    Stars within +/- 2 years
    Latitude and Logitude input:
    You can use any postion you wish - the way to input deg.min.tens are done
    this way:  120�34'5 E = -120345  :  075�45'6 W= 75456  :  55�23'6 S = -55236
    etc etc. North and West are Plus(+)
    I will include later the option to select which Lat or Long to be Plus or
    The above way to input deg.min.tens are the same with sextant inputs
    ----- Original Message -----
    From: Peter Fogg 
    Sent: Wednesday, February 06, 2002 5:52 AM
    Subject: re Lars Tornqvist nav program
    > Looks very interesting, Lars, and must represent a huge amount of work.
    > a few queries:
    > Will it run on Macintosh computers?
    > Is it independant of the correct GMT being displayed on the computer's
    > clock? Mine is decidedly inaccurate, although it is regularly updated to
    > this local time. Can the relevant local time only, with the appropriate
    > correction, be used?
    > I enjoy solving (or not) the navigational problems such as the 'Silicon
    > Sea' series on the Nav. list. These can involve data from all over the
    > world and any time zone, and any year. My own approach is to always
    > start with local time and convert to GMT when necessary. Could your
    > program cope with these parameters? For example, I note that the almanac
    > is good for the next 10 years but how far back does it go?
    > Your example shows an assumed postion in whole degrees. How would it
    > cope with a DR position that may involve one tenths of a minute of long.
    > or lat. ? (Personally I think that a DR to the nearest minute is all
    > that is needed or practical but the problem being worked on may use
    > greater precision)

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